iwlwifi: support NVM access (EEPROM/OTP)
Two type of NVM available for devices 1000, 6000 and after, adding
support to read OTP lower blocks if OTP is used instead of EEPROM.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
index b400bd5..9cc063b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.c
@@ -152,6 +152,32 @@
}
EXPORT_SYMBOL(iwlcore_eeprom_verify_signature);
+static int iwlcore_get_nvm_type(struct iwl_priv *priv)
+{
+ u32 otpgp;
+ int nvm_type;
+
+ /* OTP only valid for CP/PP and after */
+ switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
+ case CSR_HW_REV_TYPE_3945:
+ case CSR_HW_REV_TYPE_4965:
+ case CSR_HW_REV_TYPE_5300:
+ case CSR_HW_REV_TYPE_5350:
+ case CSR_HW_REV_TYPE_5100:
+ case CSR_HW_REV_TYPE_5150:
+ nvm_type = NVM_DEVICE_TYPE_EEPROM;
+ break;
+ default:
+ otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
+ if (otpgp & CSR_OTP_GP_REG_DEVICE_SELECT)
+ nvm_type = NVM_DEVICE_TYPE_OTP;
+ else
+ nvm_type = NVM_DEVICE_TYPE_EEPROM;
+ break;
+ }
+ return nvm_type;
+}
+
/*
* The device's EEPROM semaphore prevents conflicts between driver and uCode
* when accessing the EEPROM; each access is a series of pulses to/from the
@@ -198,6 +224,35 @@
}
EXPORT_SYMBOL(iwlcore_eeprom_query_addr);
+static int iwl_init_otp_access(struct iwl_priv *priv)
+{
+ int ret;
+
+ /* Enable 40MHz radio clock */
+ _iwl_write32(priv, CSR_GP_CNTRL,
+ _iwl_read32(priv, CSR_GP_CNTRL) |
+ CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
+
+ /* wait for clock to be ready */
+ ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
+ CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
+ 25000);
+ if (ret < 0)
+ IWL_ERR(priv, "Time out access OTP\n");
+ else {
+ ret = iwl_grab_nic_access(priv);
+ if (!ret) {
+ iwl_set_bits_prph(priv, APMG_PS_CTRL_REG,
+ APMG_PS_CTRL_VAL_RESET_REQ);
+ udelay(5);
+ iwl_clear_bits_prph(priv, APMG_PS_CTRL_REG,
+ APMG_PS_CTRL_VAL_RESET_REQ);
+ iwl_release_nic_access(priv);
+ }
+ }
+ return ret;
+}
+
/**
* iwl_eeprom_init - read EEPROM contents
*
@@ -209,11 +264,18 @@
{
u16 *e;
u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
- int sz = priv->cfg->eeprom_size;
+ int sz;
int ret;
u16 addr;
+ u32 otpgp;
+
+ priv->nvm_device_type = iwlcore_get_nvm_type(priv);
/* allocate eeprom */
+ if (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
+ priv->cfg->eeprom_size =
+ OTP_BLOCK_SIZE * OTP_LOWER_BLOCKS_TOTAL;
+ sz = priv->cfg->eeprom_size;
priv->eeprom = kzalloc(sz, GFP_KERNEL);
if (!priv->eeprom) {
ret = -ENOMEM;
@@ -235,30 +297,77 @@
ret = -ENOENT;
goto err;
}
-
- /* eeprom is an array of 16bit values */
- for (addr = 0; addr < sz; addr += sizeof(u16)) {
- u32 r;
-
- _iwl_write32(priv, CSR_EEPROM_REG,
- CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
-
- ret = iwl_poll_direct_bit(priv, CSR_EEPROM_REG,
- CSR_EEPROM_REG_READ_VALID_MSK,
- IWL_EEPROM_ACCESS_TIMEOUT);
- if (ret < 0) {
- IWL_ERR(priv, "Time out reading EEPROM[%d]\n", addr);
- goto done;
+ if (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP) {
+ ret = iwl_init_otp_access(priv);
+ if (ret) {
+ IWL_ERR(priv, "Failed to initialize OTP access.\n");
+ ret = -ENOENT;
+ goto err;
}
- r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
- e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
+ _iwl_write32(priv, CSR_EEPROM_GP,
+ iwl_read32(priv, CSR_EEPROM_GP) &
+ ~CSR_EEPROM_GP_IF_OWNER_MSK);
+ /* clear */
+ _iwl_write32(priv, CSR_OTP_GP_REG,
+ iwl_read32(priv, CSR_OTP_GP_REG) |
+ CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK |
+ CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK);
+
+ for (addr = 0; addr < sz; addr += sizeof(u16)) {
+ u32 r;
+
+ _iwl_write32(priv, CSR_EEPROM_REG,
+ CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
+
+ ret = iwl_poll_direct_bit(priv, CSR_EEPROM_REG,
+ CSR_EEPROM_REG_READ_VALID_MSK,
+ IWL_EEPROM_ACCESS_TIMEOUT);
+ if (ret < 0) {
+ IWL_ERR(priv, "Time out reading OTP[%d]\n", addr);
+ goto done;
+ }
+ r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
+ /* check for ECC errors: */
+ otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
+ if (otpgp & CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK) {
+ /* stop in this case */
+ IWL_ERR(priv, "Uncorrectable OTP ECC error, Abort OTP read\n");
+ goto done;
+ }
+ if (otpgp & CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK) {
+ /* continue in this case */
+ _iwl_write32(priv, CSR_OTP_GP_REG,
+ iwl_read32(priv, CSR_OTP_GP_REG) |
+ CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK);
+ IWL_ERR(priv, "Correctable OTP ECC error, continue read\n");
+ }
+ e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
+ }
+ } else {
+ /* eeprom is an array of 16bit values */
+ for (addr = 0; addr < sz; addr += sizeof(u16)) {
+ u32 r;
+
+ _iwl_write32(priv, CSR_EEPROM_REG,
+ CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
+
+ ret = iwl_poll_direct_bit(priv, CSR_EEPROM_REG,
+ CSR_EEPROM_REG_READ_VALID_MSK,
+ IWL_EEPROM_ACCESS_TIMEOUT);
+ if (ret < 0) {
+ IWL_ERR(priv, "Time out reading EEPROM[%d]\n", addr);
+ goto done;
+ }
+ r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
+ e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
+ }
}
ret = 0;
done:
priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
err:
if (ret)
- kfree(priv->eeprom);
+ iwl_eeprom_free(priv);
alloc_err:
return ret;
}
@@ -301,6 +410,8 @@
u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
{
+ if (!priv->eeprom)
+ return 0;
return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
}
EXPORT_SYMBOL(iwl_eeprom_query16);